<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>

<p id="js">JavaScript</p>
<div id="list">
  <p id="se">javaSE</p>
  <p id="me">javaME</p>
  <p id="ee">javaEE</p>
</div>

<script>
  var js = document.getElementById('js');
  var list = document.getElementById('list');
  list.appendChild(js);   // 追加到最后
</script>

</body>
</html>